Diameter growth rates of tawa across the middle North Island. (a) overall size-specific models of tawa growth for average trees and for rapidly-growing trees; and (b) size-specific average tawa growth from a subset of the data in (a) where local basal area (BA) could be modelled (permanent forest plots in Pureora, Kaimai Range (Wharawhara), Rotorua Lakes, Mt Egmont/Taranaki, archived in NVS, see Table 1). Low, Medium and High Basal Area = 38, 58, 130 m2 ha−1, respectively. Adapted from Hurst et al. ().